Audio interface



FIG. 1 is a perspective view of an ornamental design for a audio interface;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a first side view thereof;

FIG. 5 is a second side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line in FIGS. 1–7 showing environmental structures is for illustrative purposes and forms no part of the claim design. 

The ornamental design for an audio interface, as shown and described. 